package day07;

import java.util.Random;

/**
 * 说明:
 *
 * @author:SuZhongHe
 * @date:2023/2/20
 **/
public class VerificationCode {
    public static void main(String[] args) {
        String code = generateVeriCode(5);
        System.out.println("验证码:  " + code);
    }

    public static String generateVeriCode(int len) {
        String code = "";
        char[] chs = {
                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
                't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
                'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z','0', '1', '2', '3', '4', '5',
                '6', '7', '8', '9',
        };
        Random random = new Random();
        for (int i = 0; i < len; i++) {
            int index = random.nextInt(chs.length);
            //int index = (int) (Math.random() * chs.length);
            code += chs[index];
        }
        return code;
    }
}
